population Density in japan :Life in a crowded country 

How does population density affects life in a crowded country such as japan ?

population density affects life in japan by smaller housing and having to build under ground and there is much bigger chance to get sick in japan because of the people and transportation is crowded and allot of traffic.yet Japans has a much higher life expectancy and they recycle more

this is what population density has done to normal streets in japan you can bearly breathe or walk you cant get to your destination on time